Hi,
Refer to these methods and check.
Method 1:
Clear all your temp directories.
a. Press Windows key and R key together.
b. Type in %temp% and press enter.
c. Delete the all files and folders.
Also run Disk Cleanup.
Delete files using Disk Cleanup.
Method 2:
Delete sub keys of Mounted Images and check.
a. Press Windows key and R key together.
b. Type in regedit and press enter.
c. Go to the following location and delete sub keys of Mounted Images.
Browse to "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WIMMount\Mounted Images"
Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, refer the steps:
a) Click on the “Windows+R” keys simultaneously, type “regedit” (without the quotes) and hit “Enter”.
b) Now, click on “File” and select “Export”. Save it to the desired location.
c) If you make any mistakes while editing the registry, then you can just Right Click on the Exported file and select “Import”.
Thank you.